What would happen to Mercury and Pluto if they moved at the same speed as Earth?

BuStAzBuStAz

New member
my answer is -the planets would eventually collide......-
I don't know if thats right i need some more insight.
(9th grade physical science)
don't planets need to have the same circumference if there moving the same speed do to the force of the suns gravity?
and don't different planets orbit in different directions?
 
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